// Array
let arr = [1, 2, 5];
// Object
let user = {
  name: "Jason",
  age: 24,
};
// Date 返回时间撮
let now = new Date();
// Function
function fun() {
  return 10;
}

console.log("Array:", arr.valueOf());
console.log("Object:", user.valueOf());
console.log("Date:", now.valueOf());
console.log("Function:", fun.valueOf());
